score:2

Accepted answer

You need to use tooltip formatter then you can customise content.

score:7

set property useHTML to true and you'll be able to use <br/> for making a new line

tooltip: {
        useHTML: true,
        headerFormat: '<b>{series.name}</b><br>',
        pointFormat: '{point.x:%b %e <br/> %H:%M}: {point.y:.3f}'
    },

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